Head restraint

ABSTRACT

A head restraint assembly for use with a vehicle seat, the head restraint assembly having a head restraint armature that is adapted to be attached to a seat back, including two spaced apart support posts, a cushion surrounding the head restraint armature and a strap that is affixed to the head restraint armature, the strap extending between the two spaced apart support posts. The strap is also surrounded by the cushion.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to head restraint assemblies for use with vehicleseat assemblies.

2. Background Art

Because of concern for the safety of vehicle occupants, vehicles havetraditionally been the subject of extensive government regulation. Suchregulations set forth standards with which the vehicle and/or itscomponents must comply. One component that has been the subject ofregulation is the vehicle head restraint assembly.

FMVSS-202a prescribes a minimum “backset retention” for a head restraintassembly. The backset retention test prescribed by FMVSS-202a requiresthat a head restraint assembly be able to withstand a specified level offorce without experiencing a greater than a specified displacement.Current head restraint assemblies having only a head restraint armatureand a foam cushion may be unable to satisfy the requirements ofFMVSS-202a because of the deformation experienced by the foam cushionupon the application of the specified force. Applicants' inventionpresents a solution to this potential problem.

SUMMARY OF THE INVENTION

Under the invention, a new head restraint assembly for use with avehicle seat is provided. In a first embodiment, a head restraintarmature that is adapted to be attached to a seat back is provided. Thehead restraint armature includes two spaced apart support posts. Acushion is provided surrounding the head restraint armature.Additionally, a strap is affixed to the head restraint armature. Thestrap extends between the two spaced apart support posts and issurrounded by the cushion.

In at least one implementation of the first embodiment, the strapdefines a closed loop having opposing sides. The strap is affixed to thehead restraint armature such that the strap wraps around at least aportion of each support post. In at least another implementation, atleast one of the support posts has a notch and the strap has aprotrusion that cooperates with the notch to secure the strap.

In at least another implementation of the first embodiment, the armatureincludes an adjoining portion that adjoins the two spaced apart supportposts and the strap has a saddle portion extending between the opposingsides of the strap. In at least one variation of this implementation, anunderside of the saddle portion rests against a top portion of theadjoining portion of the armature when the strap is affixed to the headrestraint armature. In at least another variation of thisimplementation, the saddle portion includes a protrusion that holds thestrap in place on the armature.

In at least another implementation of the first embodiment, the strap ismade from a material comprising plastic. In at least one suchimplementation, the plastic comprises polypropylene. In at least onevariation of this implementation, the plastic comprises glass filledpolypropylene. In at least another variation of this implementation, theratio of polypropylene to glass is approximately 4 to 1.

In at least another implementation of the first embodiment, the strap isin the general shape of a crescent when viewed from above a top portionof the strap prior to mounting the strap to the support posts. In thisimplementation, the strap is in tension when the strap is mounted to thetwo support posts. In at least one variation of this implementation, thestrap is orientated so as to be concave with respect to a front portionof the cushion.

In at least another implementation of the first embodiment, the straphas a thickness of approximately two millimeters.

In at least another implementation of the first embodiment, the armatureincludes an adjoining portion that adjoins the two support posts and atop portion of the strap is positioned approximately 50 millimetersbelow the adjoining portion.

In a second embodiment, a strap is provided for use with a vehicle seathead restraint assembly having an armature, the armature having twospaced apart support posts and an adjoining portion that adjoins the twosupport posts. The strap comprises a band generally defining a closedloop having opposing sides. The band also has a protrusion. In thisembodiment, the band is mountable to the two posts and securable to thehead restraint assembly by cooperation of the protrusion with a notch inthe armature.

In at least one implementation of the second embodiment, the band has asaddle portion extending between a top portion of the opposing sides ofthe band. In a variation of this implementation, the protrusion isdisposed on the saddle portion, the protrusion being capable ofcooperating with the adjoining portion to secure the band to theadjoining portion when the band is mounted to the two posts. In at leastone variation of this implementation, the band is made from a materialcomprising polypropylene. In a further variation, the band is made froma material comprising glass filled polypropylene wherein the ratio ofpolypropylene to glass is 4 to 1.

In a third embodiment, a strap in combination with an automotive seathead restraint assembly is provided. In this embodiment, the combinationcomprises a head restraint assembly having two posts that aresubstantially upright, rigid, spaced apart and oriented alongsubstantially parallel axes and a rigid joining member that is orientedsubstantially traverse to the two posts, the rigid joining memberrigidly connecting the two posts. The combination further comprises aband generally defining a closed loop having opposing sides, the bandbeing made from a material comprising plastic, the band having a topportion and an integral saddle portion extending between the top portionof the opposing sides of the band. The band is mounted to the headrestraint assembly such that the band wraps around a portion of each ofthe two posts and the saddle portion wraps around a portion of the rigidjoining member. The saddle portion includes a plurality of protrusionsthat cooperate with the rigid joining member to hold the band in placeon the rigid joining member. In this embodiment, a foam cushion having afront portion envelops both the band and the rigid joining member.

In at least one implementation of the third embodiment, the band isgenerally in the shape of a crescent when viewed from above the topportion prior to mounting the band to the head restraint assembly. Inthis implementation, the band is placed in tension when the band ismounted to the two posts. In this implementation, the band and theextension are made from a material comprising glass filled polypropylenewith a ratio of polypropylene to glass is 4 to 1.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cutaway perspective view of an embodiment of a headrestassembly made in accordance with the present invention;

FIG. 2 is a perspective view of a head restraint armature and a headrestraint strap of the head restraint assembly of FIG. 1;

FIG. 3 is a perspective view of the head restraint strap of FIG. 1;

FIG. 4 is a side elevational view of the head restraint strap of FIG. 1;

FIG. 5 is a plan view of the head restraint strap of FIG. 1;

FIG. 6 is a perspective view of an alternative embodiment of a headrestraint strap made in accordance with the present invention; and

FIG. 7 is a cross sectional view taken along the line 7-7 of FIG. 6.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S)

Reference will now be made in detail to the illustrated embodiments ofthe present invention which constitute the best modes of practicing theinvention presently known to the inventor. The following descriptionsare merely exemplary in nature and are in no way intended to limit theinvention, its application, or uses. The figures are not necessarilydrawn to scale. Therefore, specific details disclosed therein are not tobe interpreted as limiting, but merely as a representative basis for anyaspect of the invention and/or as a representative basis for teachingone skilled in the art to variously employ the present invention.

As best shown in FIG. 1, at least one embodiment of the presentinvention includes a head restraint assembly 10 for use with a seatassembly (not shown) mounted to a vehicle (not shown). While headrestraint assembly 10 may be used in any vehicle including boats,airplanes, and trains, in a preferred embodiment, head restraintassembly 10 is used in an automobile. As illustrated in FIG. 1, headrestraint assembly 10 comprises a head restraint armature 12, a strap orband 14, and a cushion 16. Head restraint assembly 10 may be mounted toan automobile seat assembly and positioned behind the head of anoccupant.

In the embodiment illustrated in FIG. 1, head restraint armature 12provides structural support to head restraint assembly 10. Headrestraint armature 12 can be made from any rigid material, such asmetal, that is resilient to the application of forces such as thoseexerted by an occupant's head during a rear end collision. Metalssuitable for use in the head restraint armature 12 include carbon steel,stainless steel, aluminum alloys, and in a preferred embodiment, highstrength low alloy steel.

Head restraint armature 12 includes two support posts 18, 20. In theillustrated embodiment, the two support posts 18, 20 are spaced apartand are substantially parallel to one another. The head restraintassembly 10 may be mounted to a vehicle seat back by inserting a portionof the support posts 18, 20 within cavities in the vehicle seat back(not shown). In some embodiments, the portions of support posts 18, 20that are received within a vehicle seat back may have notches thatcooperate with the vehicle seat back to allow the head restraintassembly to be adjustable up and down with respect to the vehicle seatback. In other embodiments, the head restraint assembly 10 is notadjustable. In some embodiments, head restraint assembly 10 is bolted,welded, and/or otherwise affixed to the seat back.

In the illustrated embodiment, the support posts 18, 20 extend upwardinto the cushion 16 and support cushion 16 on the vehicle seat assembly.As shown in FIGS. 1 and 2, the support posts 18, 20 are connected by anadjoining portion 22. In the illustrated embodiment, adjoining portion22 is integral with the two support posts 18, 20. In other embodiments,the adjoining portion 22 may be connected to the support posts, 18, 20,with nuts, bolts, a weld, or any other mechanism or method effective torigidly connect the two support posts, 18, 20 to each other.

As illustrated, strap 14 is a closed loop (this is best illustrated inFIG. 3). As shown in FIGS. 1 and 2, the strap 14 is affixed to the headrestraint armature 12 such that it wraps around a portion of the twosupport posts 18, 20. In the embodiment of the strap 14 illustrated inFIGS. 1-5, a saddle portion 24 extends upward from, and adjoins,opposing sides of strap 14. In the illustrated embodiment, saddleportion 24 is integral with strap 14. In other embodiments, the saddleportion 24 may be made separately from strap 14 and then attached tostrap 14 using epoxy, fasteners or any other mechanism or methodeffective to join the saddle portion 24 to strap 14.

The strap 14 may be made from a material comprising plastic. The plasticmaterial may comprise polypropylene. The plastic material may compriseglass filled polypropylene. In a preferred embodiment, the strap is madefrom a material comprising glass filled polypropylene wherein the ratioof polypropylene to glass is 4 to 1. The strap 14 may be manufactured bya variety of processes including extrusion, injection molding, blowmolding, bonding, or fastening to form a strap.

As illustrated in FIG. 1, cushion 16 envelops the head restraintarmature 12 and the strap 14. The cushion 16 may be made from anymaterial effective to cushion an occupant's head and is preferably madefrom a foam. In a preferred embodiment, the strap 14 is positioned onthe head restraint armature 12 and the assembly is then placed in a moldinto which foam is introduced. The loop configuration of strap 14permits the foam to flow freely throughout the mold including the areabetween the opposing sides of the strap 14. The foam in the moldenvelops a portion of the two support posts 18, 20, the adjoiningportion 22 and the strap 14. In a preferred embodiment the foam is apolyurethane foam. In other embodiments, the foam may be expandablepolypropylene or expandable polyethylene.

FIG. 2 depicts a head restraint armature 12 and the strap 14 of FIG. 1without the cushion 16. As shown in FIG. 2, strap 14 wraps around bothsupport posts 18, 20. Protrusions 26 are disposed on the saddle portion24 of strap 14. In other embodiments, protrusions may be disposed alongother portions of the strap 14. Protrusions 26 (as best illustrated inFIGS. 3 and 4) hold strap 14 in position on the head restraint armature12 by cooperating with the adjoining portion 22. Protrusions 26 form aphysical obstruction that contacts the adjoining portion 22 when strap14 is mounted on head restraint armature 12 and that hold strap 14 onhead restraint armature 12 in a snap fit or inference fit. In someembodiments, protrusions 26 may snugly and securely hold strap 14 inposition on head restraint armature 12. In other embodiments,protrusions 26 may be configured to loosely hold strap 14 in position onhead restraint armature 12. Protrusion 26 may be integrally molded intosaddle portion 24 or may be separately manufactured and attached by anymeans effective to secure protrusions 26 to the saddle portion 24.

As best illustrated in FIG. 3, saddle portion 24 extends upwardly fromopposite sides of the strap 14 to join opposing sides of strap 14. Inthe embodiment illustrated in FIG. 3, the saddle portion 24 is centeredon the strap 14. In other embodiments, the saddle portion 24 may be offcenter. In other embodiments, the saddle portion 24 may join opposingbut not opposite sides of strap 14. In other embodiments, the strap 14may have a plurality of saddle portions 24.

FIG. 4 illustrates a side view of the strap 14. This view best shows theconfiguration of protrusions 26 as protruding inwardly from oppositesides of the saddle portion 24. As the strap 14 is positioned over thehead restraint armature 12, the adjoining portion 22 would protrudethrough the interior portion of the strap 14, until it comes intocontact with protrusions 26. At that time, additional force may beneeded to permit the adjoining portion 22 to push past the protrusions26, thereby allowing the strap 14 to be properly seated and restrainedon the head restraint armature 12.

With the strap 14 mounted on the head restraint armature 12 and embeddedwithin the cushion 16, the strap 14 is positioned in the path of anoccupant's head as it moves rearward during a rear end collision. Inthis position, the strap 14 may transfer some of the forces exertedduring a collision from the cushion 16 to the head restraint armature12. In a preferred embodiment, the top portion 28 of the strap 14 ispositioned approximately 50 millimeters below the bottom portion 34 ofthe adjoining portion 22(illustrated as distance D in FIG. 2).

In a preferred embodiment, there is a bend through the approximatecenter of the strap 14 such that, when viewed from above, the strap 14is in the general shape of a crescent. (See FIG. 5.) The bend in thecenter of strap 14 has the effect of moving the far ends 30, 32 of thestrap 14 closer together. The far ends 30, 32 must be stretched slightlyapart to allow the strap 14 to be positioned on the head restraintarmature 12, which has the effect of slightly stretching and/orstraightening strap 14 as it is placed over the head restraint armature12. This stretching and/or straightening causes the strap 14 to undergotension. The angle of the strap 14 has the effect of enhancing thestrap's 14 ability to transfer forces from the cushion 16 to the headrestraint armature 12 during a collision. In a preferred embodiment, thecrescent shaped strap 14 will be placed on the head restraint armature12 such that the strap 14 is concave with respect to a front portion ofthe cushion 16.

While the strap 14 may have any suitable thickness, in a preferredembodiment, the strap 14 will have a thickness T (see FIG. 5) of between1.85 and 2.15 millimeters and in a most preferred embodiment, the strap14 will have a thickness T of approximately 2 millimeters.

An alternative embodiment of strap 14 is shown in FIGS. 6 and 7. In thisembodiment, the strap 14 does not have the saddle portion 24. Rather,the head restraint armature 12 has at least one notch 36 at an upperpart of the head restraint armature 12 that cooperates with theprotrusions 26 of the strap 14 to retain the strap 14 in position on thehead restraint armature 12. This configuration is best shown in FIG. 7.When attaching the embodiment of the strap 14 depicted in FIGS. 6 and 7to the head restraint armature 12, the strap 14 is placed over the topof the head restraint armature 12 and pushed downward until protrusion26 snaps into notch 36. The notch 36 may be located at any point aroundthe perimeter of the head restraint armature 12 that comes into contactwith the strap 14, and is preferably located at an outboard position tofacilitate assembly.

This invention has many advantages and attributes. Some embodiments ofthe present invention may completely satisfy the requirements ofFMVSS-202a while other embodiments may simply provide added strength andresistance.

While the best mode for carrying out the invention has been described indetail, those familiar with the art to which this invention relates willrecognize various alternative designs and embodiments for practicing theinvention as defined by the following claims.

1. A head restraint assembly for use with a vehicle seat, the headrestraint assembly comprising: a head restraint armature adapted to beattached to a seat back, the head restraint armature including twospaced apart support posts; a cushion surrounding the head restraintarmature; and a strap affixed to the head restraint armature, the strapextending between the two spaced apart support posts, and the strapbeing surrounded by the cushion.
 2. The head restraint assembly of claim1 wherein the strap defines a closed loop having opposing sides andwherein the strap is affixed to the head restraint armature such thatthe strap wraps around at least a portion of each support post.
 3. Thehead restraint assembly of claim 2, wherein at least one of the supportposts has a notch and wherein the strap has a protrusion that cooperateswith the notch to secure the strap.
 4. The head restraint assembly ofclaim 2 wherein the armature includes an adjoining portion that adjoinsthe two spaced apart support posts, and wherein the strap has a saddleportion extending between the opposing sides of the strap, an undersideof the saddle portion resting against a top portion of the adjoiningportion of the armature when the strap is affixed to the head restraintarmature.
 5. The head restraint assembly of claim 4 wherein the saddleportion includes a protrusion that holds the strap in place on thearmature.
 6. The head restraint assembly of claim 1 wherein the strap ismade from a material comprising plastic.
 7. The head restraint assemblyof claim 6 wherein the plastic comprises polypropylene.
 8. The headrestraint assembly of claim 6 wherein the plastic comprises glass filledpolypropylene.
 9. The head restraint assembly of claim 8 wherein theratio of polypropylene to glass is approximately 4 to
 1. 10. The headrestraint assembly of claim 1 wherein the strap is in the general shapeof a crescent when viewed from above a top portion of the strap prior tomounting the strap to the two support posts, and wherein the strap is intension when the strap is mounted to the two support posts.
 11. The headrestraint assembly of claim 10 wherein the strap is oriented so as to beconcave with respect to a front portion of the cushion.
 12. The headrestraint assembly of claim 1 wherein the strap has a thickness ofapproximately 2 mm.
 13. The head restraint assembly of claim 1 whereinthe armature includes an adjoining portion that adjoins the two supportposts and wherein a top portion of the strap is positioned approximately50 mm below the adjoining portion.
 14. A strap for use with a vehicleseat head restraint assembly having an armature, the armature having twospaced apart support posts and an adjoining portion that adjoins the twosupport posts, the strap comprising: a band generally defining a closedloop having opposing sides, the band being made from a materialcomprising plastic, the band having a protrusion, the band beingmountable to the two posts and the band being securable on the headrestraint assembly by cooperation of the protrusion with the armature.15. The strap of claim 14 wherein the band has a saddle portionextending between a top portion of the opposing sides of the band. 16.The strap of claim 15 wherein the protrusion is disposed on the saddleportion, the protrusion being capable of cooperation with the adjoiningportion to secure the band to the adjoining portion when the band ismounted to the two posts.
 17. The strap of claim 16 wherein the band ismade from a material comprising polypropylene.
 18. The strap of claim 16wherein the band is made from a material comprising glass filledpolypropylene wherein the ratio of polypropylene to glass is 4 to
 1. 19.A strap in combination with an automotive seat head restraint assemblycomprising: a head restraint assembly having two posts that aresubstantially upright, substantially rigid, spaced apart and orientedalong substantially parallel axes, and a rigid joining member that isoriented substantially transverse to the two posts, the rigid joiningmember rigidly connecting the two posts; a band generally defining aclosed loop having opposing sides, the band being made from a materialcomprising plastic, the band having a top portion and an integral saddleportion extending between the top portion of the opposing sides of theband, the band being mounted to the head restraint assembly such thatthe band wraps around a portion of each of the two posts and the saddleportion wraps around a portion of the rigid joining member, the saddleportion including a plurality of protrusions that cooperate with therigid joining member to hold the band in place on the rigid joiningmember; and a foam cushion having a front portion, the foam cushionenveloping the band and the rigid joining member.
 20. The combination ofclaim 19 wherein the band is generally in the shape of a crescent whenviewed from above the top portion prior to mounting the band to the headrestraint assembly, wherein the band is placed in tension when the bandis mounted to the two posts, and wherein the band and the extension aremade from a material comprising glass filled polypropylene wherein theratio of polypropylene to glass is 4 to 1.